package com.nowcoder.community.event;

import com.alibaba.fastjson.JSONObject;
import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.entity.Event;
import com.nowcoder.community.entity.Message;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.service.ElasticsearchService;
import com.nowcoder.community.service.MessageService;
import com.nowcoder.community.util.CommunityConstant;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

//代替service的方法
@Component
public class EventConsumer implements CommunityConstant {
    private static final Logger logger = LoggerFactory.getLogger(EventConsumer.class);
    private final MessageService messageService;
    private final DiscussPostService discussPostService;
    private final ElasticsearchService elasticsearchService;

    public EventConsumer(ElasticsearchService elasticsearchService, DiscussPostService discussPostService, MessageService messageService) {
        this.elasticsearchService = elasticsearchService;
        this.discussPostService = discussPostService;
        this.messageService = messageService;
    }

    @KafkaListener(topics = {TOPIC_COMMENT, TOPIC_LIKE, TOPIC_FOLLOW})
    public void handleCommentMessage(ConsumerRecord record){
        if(record == null || record.value() == null){
            logger.error("消息内容为空");
            return;
        }
        Event event = JSONObject.parseObject(record.value().toString(), Event.class);
        if(event == null){
            logger.error("消息格式有误");
            return;
        }
        // 发送站内通知
        Message message = new Message();
        message.setFromId(SYSTEM_USER_ID);
        message.setToId(event.getEntityUserId());
        message.setConversationId(event.getTopic());
        message.setCreateTime(new Date());

        Map<String, Object> content = new HashMap<>();
        content.put("userId", event.getUserId());
        content.put("entityType", event.getEntityType());
        content.put("entityId", event.getEntityId());

        if(!event.getData().isEmpty()) {
            for(Map.Entry<String, Object> entry : event.getData().entrySet()){
                content.put(entry.getKey(), entry.getValue());
            }
        }

        message.setContent(JSONObject.toJSONString(content));
        messageService.addMessage(message);
    }

    //消费发帖事件
    @KafkaListener(topics ={TOPIC_PUBLISH})
    public void handlePublishMessage(ConsumerRecord record){
        if(record == null || record.value() == null){
            logger.error("消息内容为空");
            return;
        }
        Event event = JSONObject.parseObject(record.value().toString(), Event.class);
        if(event == null){
            logger.error("消息格式有误");
            return;
        }
        DiscussPost post = discussPostService.findDiscussPostById(event.getEntityId());
        if(post != null)
            elasticsearchService.saveDiscussPost(post);
    }

    @KafkaListener(topics ={TOPIC_DELETE})
    public void handleDeleteMessage(ConsumerRecord record){
        if(record == null || record.value() == null){
            logger.error("消息内容为空");
            return;
        }
        Event event = JSONObject.parseObject(record.value().toString(), Event.class);
        if(event == null){
            logger.error("消息格式有误");
            return;
        }
        elasticsearchService.deleteDiscussPost(event.getEntityId());

    }
}
